• Convergence Security Journal
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• v.12 no.3
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• pp.93-97
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• 2012

In this paper, we apply the next generation Internet TV solution, FLV has been designed and implemented. Currently being broadcast in the field to compress HD video in real time, as well as live Internet VOD services are available through the online system, the Internet LIVE broadcast and VOD service easy to operate and UCC services that support the solution. VOD video cameras and in real time using H264 CORECODEC to compress MPEC4, WMV, and real-time video streaming on the Internet, and phone system that supports the first, real-time recording of camera images featured nation's first real-time encoder system (Real time encoder system) is, Web and smart environment suitable for supporting the latest CORECODEC technology and software products. Second, the video can be played in MP4 player and customize your chat, and Custer (customizing) is a possible two-way Internet Broadcasting System. Third, CMS (Contents Management System) feature video content and course management content in real time via the Android phone and iPhone streaming service is available.

• Proceedings of the Korean Society of Propulsion Engineers Conference
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• 2012.05a
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• pp.586-591
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• 2012

The solution of maintenance decision support system for the gas turbine engine, which is currently operating in GUNSAN combined cycle power plant, was developed and is consist of online monitoring module, periodic performance trending module, optimal compressor washing interval analysis module and hot component management module. Also, GUI platform was applied to this solution for the user to monitoring the analyzed result of engine performance condition and then to make a decision of the consequent maintenance action. In online condition monitoring module, the performance degradation of engine is provided by the analysis of difference between the real time measurement data compared to exist engine performance. The optimal compressor washing interval module produced the washing interval of maximum net profit value by researching the maintenance expense and the loss profit value corresponds to the performance degradation with economic assessment algorithm. Thus, this solution support the user to enable the optimal maintenance and operation of gas turbine engine with overall analysis of engine condition and main information.

• Journal of Digital Convergence
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• v.12 no.4
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• pp.251-257
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• 2014

In u-Healthcare environment, large amounts of important vital information is processed through M2M(Machine to Machine). M2M is configured by wireless networks and has several problems for limited bandwidth and low reliability. Therefore, in this paper is proposed a method called uHLZW(u-Healthcare LZW) to improve channel efficiency to solve such problem. uHLZW algorithm has high compression ratio for vital data. The results showed that the average compression ratio of uHLZW got from 1.6 times to 4.0 times better than existing methods(Huffman and LZW compression).

• Proceedings of the Korean Society of Broadcast Engineers Conference
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• 2021.06a
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• pp.67-69
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• 2021

인공 지능, 사물 인터넷, 클라우드 컴퓨팅, 빅데이터, 모바일을 중심으로 시작된 4차 산업혁명은 최근 메타버스(Metaverse)시대로 자연스럽게 확장되어 가고 있다. 메타버스 시대의 핵심 기술인 VR(Virtual Reality)/AR(Augmented Reality)/MR(Mixed Reality)과 이를 디스플레이 하기 위한 HMD(Head Mounted Display)나 글래스(glass) 장치들은 사용자에게 고품질 영상뿐만 아니라 3차원 공간에 대한 6DoF(Degrees of Freedom)급의 자유도를 제공해야 한다. 이에 발맞춰 MPEG에서는 최근 실사 및 CG(Computer Graphics)로 제작된 다시점 텍스쳐 및 깊이 영상에 대한 효과적인 압축 방법을 찾기 위한 MIV(MPEG Immersive Video) 표준화를 진행중이다. 본 논문은 최신 2차원 압축 표준인 VVC(Verstitle Video Coding)를 기반으로 MPEG MIV 1.0 표준 프레임워크를 검증해본다. 특히 높은 압축율에 비해 복잡도가 높은 VVC 표준의 특성을 고려하여 HHI에서 개발한 최적화 코덱인 VVenC를 이용하여 압축 효율과 복잡도 관점에서 MIV 표준 활용을 위한 최적의 솔루션을 찾고자 한다.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2007.10a
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• pp.145-148
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• 2007

영상전송에 있어서 주변 환경에 대한 영상인식은 대단히 중요하다. 최근 정보인프라의 대중화에 따라 모바일 환경에서까지 유, 무선을 통한 대상의 상태를 영상으로 확인하려는 사용자 중심적 욕구가 증가하였다. 하지만 기존의 모바일용 솔루션은 저대역폭을 가지는 모바일 단말기 기반의 네트웍 특성상 소프트웨어 코덱만을 지원하므로서 소프트웨어적인 처리의 한계로 인한 고화질의 영상은 기대할 수 없었다. 이러한 단점을 해결하기 위해서 본 논문에서는 모바일 환경에서까지 고화질 지원과 실시간적 요소를 고려하여 높은 압축률을 가지는 국제 비디오 압축 표준인 MPEG-4에 기반을 두어 하드웨어 코덱 설계에 관하여 기술하였다. 이를 위한 하드웨어의 최적화된 설계를 위하여 임베디드용 전용 CPU 채용과 MPEG-4에 기반한 하드웨어 코덱을 설계하였다. 구현된 시스템은 모바일 환경에서도 전송속도 및 해상도 등에 있어서 우수한 성능을 나타내었다.

• Proceedings of the Korea Information Processing Society Conference
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• 2011.04a
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• pp.433-436
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• 2011

자원 제약적인 임베디드 시스템 기반의 비디오 압축/전송 시스템에서 고수준의 영상품질과 에너지 효율성을 동시에 만족시키는 것은 쉽지 않은 문제이다. 본 논문에서는 동작 주파수 설정을 이용하여 주어진 네트워크 환경과 영상품질을 만족하면서 에너지 소비가 최소화되는 솔루션을 제안한다. 즉, 주어진 네트워크 환경에서 압축/영상품질의 상관관계를 분석하고 에너지가 최소화되도록 동작 주파수를 결정한다. JPEG을 이용한 실험 결과, 동작 주파수 설정을 이용한 방법은 기존의 방법 보다 사용자가 요구하는 영상품질을 만족하면서 약 60% 정도 에너지를 절감할 수 있음을 확인하였다.

• Transactions of the Korean hydrogen and new energy society
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• v.34 no.2
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• pp.141-148
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• 2023

The thermodynamic performance of the electrochemical hydrogen compressor was analyzed to perform a comparative analysis with the performance of the mechanical compressor. The performance was analyzed through the applied current and the measured voltage value. The test results showed that the efficiency of the electrochemical hydrogen compressor was high in the low current density range. In addition, it was confirmed that the amount of increasing compress work of the electrochemical hydrogen compressor is smaller than that of the mechanical compressor. Therefore, it is expected to have higher efficiency than mechanical compression when compressed with a sufficiently high-pressure range.

• Journal of Digital Convergence
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• v.13 no.5
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• pp.227-235
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• 2015

In order to tackle healthcare expenditure problems that affects a crucial part of government finances world-wide, m-Health emerged as a solution. However, recent poor outcomes of m-Health led to the need for reform in m-Health services. Therefore the purpose of this research is to propose a solution for efficient vital data transmission and storing in m-Health environment as part of such initiative. Methods included development of an efficient system and algorithm for vital data. For results, the compression ratio of the proposed solution was compared and evaluated. Results showed a compression ratio of 30.4. The proposed system is envisioned to contribute to the future vital data monitoring system in m-Health.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2007.06a
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• pp.626-629
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• 2007

The digital content was supplied quickly with advancement of video compressive technique and the network. Simultaneously illegal copy and diffuse via Internet, it was caused to necessitate the intellectual property right protection of the digital content. With this background, Various standardization groups and content provision enterprises developed the solution for a digital content protection. But the problem which lack interoperability is appeared, cause of independent development among other equipment. To find solution about this, MPEG(Moving Picture Experts Group) has progressed standardization against IPMP (Intellectual Property Management and Protection) techniques which are possible interoperability. In spite of it, with reason why insufficient function, DMP(Digital Media Project) standard was presented with the alternative against this. In this paper, we analyze MPEG IPMP standards and DMP ToolPack concepts to compare between them, and through these, designed and implemented digital content protection system which possible interoperability.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.12 no.4
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• pp.791-799
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• 2008

An image recognition for surrounding conditions is very important in image transmission. In recently rears, as the information infrastructure is more general, the user-centered demands in which they want to identify by object's states image using wire or wireless environment have increased. However, existing mobile solution could be hard to expect high quality mage, because limitation of software processing according as network based on mobile terminal which has low band width supports software codec. To solve this weak point, this paper describes on hardware codec design based on MPEG-4 which is international video compression standard. Implemented system contains the embedded CPU for optimized design and it works high quality service as transmission speed and resolution in mobile circumstance.